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MARKETABLE SECURITIES - Schedule of Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | $ 238,790 | $ 239,945
Gross Unrealized Gain | 701 | 127
Gross Unrealized Loss | 2,512 | 7,097
Estimated Fair Value | 236,979 | 232,975
Held to maturity: |  |
Amortized Cost | 160,980 | 163,164
Gross Unrealized Gains | 2,708 | 1,258
Gross Unrealized Losses | 578 | 1,622
Estimated Fair Value | 163,110 | 162,800
Corporate bonds |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 19,724 | 19,743
Gross Unrealized Gain | 47 | 0
Gross Unrealized Loss | 27 | 789
Estimated Fair Value | 19,744 | 18,954
Mortgage-backed securities |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 95,322 | 93,083
Gross Unrealized Gain | 269 | 52
Gross Unrealized Loss | 1,845 | 3,676
Estimated Fair Value | 93,746 | 89,459
Held to maturity: |  |
Amortized Cost | 16,521 | 17,163
Gross Unrealized Gains | 93 | 54
Gross Unrealized Losses | 313 | 500
Estimated Fair Value | 16,301 | 16,717
Collateralized mortgage obligations |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 108,002 | 111,341
Gross Unrealized Gain | 184 | 0
Gross Unrealized Loss | 579 | 2,372
Estimated Fair Value | 107,607 | 108,969
Held to maturity: |  |
Amortized Cost | 3,747 | 4,059
Gross Unrealized Gains | 90 | 48
Gross Unrealized Losses | 11 | 28
Estimated Fair Value | 3,826 | 4,079
Municipal securities |  |
Available for sale: |  |
Available-for-sale debt securities, amortized cost basis | 15,742 | 15,778
Gross Unrealized Gain | 201 | 75
Gross Unrealized Loss | 61 | 260
Estimated Fair Value | 15,882 | 15,593
Held to maturity: |  |
Amortized Cost | 140,712 | 141,942
Gross Unrealized Gains | 2,525 | 1,156
Gross Unrealized Losses | 254 | 1,094
Estimated Fair Value | $ 142,983 | $ 142,004

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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